package com.donzell.web.controller.comm;

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

@Controller
@RequestMapping(value = "/image")
public class ImageController {
    /**
     * 自动装载验证码产生器
     */
    @Autowired
    private Producer captchaProducer = null;

    /**
     * 
     * @Title: getKaptchaImage
     * @Description: 生成图片验证码
     * @param  request
     * @param  response
     *  @throws Exception
     * @return void
     * @throws
     */
    @RequestMapping(value = "/VerifyCode")
    public void getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {
        HttpSession session = request.getSession();
        // 禁止图像缓存
        response.setDateHeader("Expires", 0);
        response.setHeader("Cache-Control",
                "no-store, no-cache, must-revalidate");
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        response.setHeader("Pragma", "no-cache");
        response.setContentType("image/jpeg");

        String capText = captchaProducer.createText();
        session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);

        BufferedImage bi = captchaProducer.createImage(capText);
        ServletOutputStream out = response.getOutputStream();

        // 将内存中的图片通过流动形式输出到客户端
        ImageIO.write(bi, "jpg", out);
        try {
            out.flush();
        } finally {
            out.close();
        }
    }
    
}
